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Pentala Harikrishna vs Zahar Efimenko
Bundesliga (2012/13), Emsdetten GER, rd 8, Feb-03
Spanish Game: Closed. Martinez Variation (C78)  ·  1-0
ANALYSIS [x]

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Kibitzer's Corner
Mar-29-14
Premium Chessgames Member
  offramp: White's light-squared bishop had some great pawn support in this game.
Mar-29-14  david ne: easier than the usual Saturday, got it straight away
Mar-29-14
Premium Chessgames Member
  An Englishman: Good Evening: Solved this one, much to my surprise. Question--after 20.Ne3, should Black have played 20...Bxb3 instead of taking the e-pawn?
Mar-29-14
Premium Chessgames Member
  morfishine: <37.Re8> looks like a clean winner

Obviously 37...Rxe8? loses after 38.Rxe8

and after 37.Re8 Rxb6 38.Rxc8 Qxe1+ 39.Kg2 Black is forced to play 39...Qe7 protecting his Bishop on <f8>. At this point, I think White has a technially (or positionally) won game despite being a piece down. Black's King is in prison, his Queen is hopelessly tied down to defending <f8> and his Knight is en prise. Either 40.Re8 or 40.Qe3 look strong enough to win

*****

Mar-29-14
Premium Chessgames Member
  gofer: In the longterm, black's king is boxed in and is going nowhere. In the shortterm black's king is in a mating net, so all we need to do is threaten a check and that is going to be the difference... ...also one move screams out to be played and I think it just about seeing if that works or not...

<37 Re8 ...>

37 ... Rxe8
38 Rxe8

37 ... Rdc6
38 Qxb3

I can't find a decent response for black, so we might be looking at the only other one?!

<37 ... Rxb3?>
<38 Rxc8! Qxe1+>
<39 Kg2 ...>

At this point, black feels the pressure and hopes to simply protect Bf8 and somehow "weather the storm". But white has other plans <Then he showed those men of will what will really was.>

<39 ... Qe7>
<40 Qe3!>

~~~

Yep! The point being that Bishop and Rook can give check mate without the queen and 40 ... Rxg6+ 41 Bxg6 doesn't change that the black queen is still tied to defending Bf8 and the white queen isn't! Game Over!

Mar-29-14
Premium Chessgames Member
  gofer: <morfishine> "Either 40.Re8 or 40.Qe3 look strong enough to win"

Perhaps this is true, but the two moves are poles apart as far as strength is concerned, Re8 allows Qd6 and Qc5 both of which allow some hope of counter-attack. Qe3 gives black nothing.

Mar-29-14
Premium Chessgames Member
  morfishine: <gofer> You are correct. Referencing pure visualization, at least to me, its hard to tell which move is best or strongest
Mar-29-14
Premium Chessgames Member
  Penguincw: 27.Re8 wasn't really hard to see. :)
Mar-29-14
Premium Chessgames Member
  agb2002: White has the bishop pair for a bishop and a knight.

Black threatens 37... Rxb6.

The position of the black king suggests 37.Re8:

A) 37... Rxb6 38.Rxc8 Qxe1+ (38... Nd2 39.Qf2) 39.Qf1

A.1) 39... Qe7 40.Qe2

A.1.a) 40... Qxe2 41.Rxf8#.

A.1.b) 40... Qd6 41.Qe8 + -.

A.1.c) 40... Rb7 41.Qxe7 Rxe7 42.Rxf8#.

A.1.d) 40... Rxg6+ 41.Bxg6 Qf6 42.Qe8

A.2) 39... Qg3+ 40.Kh1 Rxg6 41.Rxf8+ Kh7 42.Bg8+ Kh8 43.Bxd5+ Kh7 44.Bg8+ Kh8 45.Bxb3+ Kh7 46.Bg8+ Kh8 47.Bf7+ Kh7 48.Bxg6+ + - [R].

A.3) 39... Qe3+ 40.Qf2 Qxf2+ 41.Kxf2 Rxg6 42.Rxf8+ Kh7 43.Bg8+ as in A.3.

B) 37... Rxe8 38.Rxe8 + -.

C) 37... Rdc6 38.Bf2 Nd2 (38... Qf6 39.Qxb3) 39.Qd3 and Black loses the knight.

D) 37... Nd2 38.Qd3 looks similar to C.

Mar-29-14
Premium Chessgames Member
  kevin86: Complicated, but the main idea is going for the last row mate threats. The black king has nowhere to go!
Mar-29-14  Nick46: Absolutely spot on, mate. Efimenko's king not only had nowhere to go; it was meant to go KO.
Mar-29-14
Premium Chessgames Member
  patzer2: This Saturday's 37. Re8!! POTD solution initiates a combination which uses the deflection (a.k.a. removing the guard), weakened back rank, pin and overworked piece tactics to force a quick and clever finish to this game.
Mar-29-14  LIFE Master AJ: I only spent around 5-10 minutes on this one ...

I got the first few moves, but missed the fantabulous 40.Qe3! ('!!')

Mar-29-14
Premium Chessgames Member
  Jimfromprovidence: Nice alternative line to work through.

37...Rdc6 38 Qg4!


click for larger view

Mar-29-14  Cheapo by the Dozen: Over the board I'd play 37 Re5 or 37 Qf2, as I haven't found a win yet, and they are among the very few continuations that seem not to lose a piece. (White's bishop is both hanging and trapped, whereas Black's knight is poisoned and at the moment has flight paths.)

I presume the win is based on the very tight vise around the Black king, but the naive plan Re8/Rxc8/Rxf8+ fails to Qxe1+/Qe7, and also fails to a calm defense of the c8 rook (assuming a line in which White can't obstruct successfully with Bd8).

So no solution from me unless and until I overcome those difficulties, or else see a totally different kind of win.

Mar-29-14  LIFE Master AJ: <JimfromProv> Nice one.
Mar-29-14  Cheapo by the Dozen: So I just didn't stick with the correct line long enough. Dang. Bad miss.
Mar-29-14  PJs Studio: I missed 40.Qe3 in my analysis. Nice!!
Mar-29-14  PJs Studio: My initial thought was 42.Qe8?! Does it work also?
Mar-29-14
Premium Chessgames Member
  patzer2: Black's decisive blunder appears to be 36...Rd6?? , as 36...Bc5! (diagram below)


click for larger view

gives Black practical drawing chances..

Here (diagram aboved), 37. Bxd8?? Qxe1+ blunders and loses due to the Black Bishop's pin on the White Rook.

However, after 36...Bc5! 37. Bxc5 Nxc5 38. b3! to White maintains an edge with the initiative.

Mar-30-14
Premium Chessgames Member
  patzer2: The amazing 40. Qe3! overloads the Black Queen, because 40...Qd6 (attempting to protect both the Rook on b6 and the Bishop on f8) is met with 41. Qxb6 Qxb6?? 42. Rxf8#.

Indeed, 40. Qe3! initiates at least four simultaneous threats:

(1) 40...Qd6 41. Qxb6 .

(2) 40...Rb7 41. Qxe7 Rxe7 42. Rxf8#.

(3) 40...Qxe3 41. Rxf8#.

(4) 40...Rxg6+ 41. Bxg6 Qf6 42. f5! as in the game.

P.S.: "Double attack" is a Chess term used to broadly classify combinations utilizing tactics with multiple threats (e.g. mate or capture of a piece). However, is there a Chess term for a quadruple threat?

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